Bug d'affichage de la commande \break entre une mesure 6/8 et 12/8

[Vissale NEANG]

Bonjour,

J'ai un problème étrange avec la commande \break lorsqu'elle est
insérée entre une mesure 6/8 et 12/8 (notation batterie), la signature
12/8 s'affiche en fin de ligne. Est ce que je fais quelque chose
d'incorrect musicalement (je débute) ou est ce un bug de Lilypond ?

http://www.servimg.com/image_preview.php?i=240&u=11871667

Je suis sous Lilypond 2.12.3 sous Windows XP.

Cordialement

Vissale NEANG

%%%%%
\version "2.12.0"  % necessary for upgrading to future LilyPond versions.

\header
{
    title = "Hello World"
}

#(define mydrums '(
            (bassdrum default #f -5)
            (snare default #f 0)
            (hihat cross #f 5)
            (closedhihat cross #f 5)
            (ridecymbal cross #f 6)
            (crashcymbala cross #f 7)
            (crashcymbalb cross #f 6)
            (lowfloortom default #f -3)
            (lowtom default #f 2)
            (halfopenhihat xcircle #f 5)
            (openhihat xcircle "open" 5)
            ))


\new DrumStaff \with
{
    \remove "Time_signature_engraver"
    \remove "Clef_engraver"
    \remove "Bar_engraver"

    fontSize = #-3
    \override StaffSymbol #'staff-space = #(magstep -3)
}
<<
    \set DrumStaff.drumStyleTable = #(alist->hash-table mydrums)
    \stemDown \drummode
    {
        \time 1/4
        \textLengthOn
        sn4^\markup {\rotate #45 \line {snare}}

        \stemUp
        hh^\markup {\rotate #45 \line {hi-hat}}
        hhho^\markup {\rotate #45 \line {half open}}
        cymca^\markup {\rotate #45 \line {crash}}
        cymr^\markup {\rotate #45 \line {ride}}
    }
>>

\new DrumStaff
<<
    \set DrumStaff.drumStyleTable = #(alist->hash-table mydrums)

    %#(override-auto-beam-setting '(end * * * *) 1 4 'DrumStaff)
    %#(override-auto-beam-setting '(end * * * *) 2 4 'DrumStaff)
    %#(override-auto-beam-setting '(end * * * *) 3 4 'DrumStaff)
    %#(override-auto-beam-setting '(end * * * *) 4 4 'DrumStaff)

    \stemDown \drummode
    {
        \time 12/8
        <<
            \new DrumVoice { \voiceOne { hh8 hh hh hh hh hh hh hh hh
hh hh hh } }
            \new DrumVoice { \voiceTwo { bd4. sn bd sn8 r bd} }
        >>

        \time 6/8
        <<
            \new DrumVoice { \voiceOne { hh8 hh hh hh hh hh } }
            \new DrumVoice { \voiceTwo { bd4. sn } }
        >>
        \break

        \time 12/8
        <<
            \new DrumVoice { \voiceOne { hh8 hh hh hh hh hh hh hh hh
hh hh hh } }
            \new DrumVoice { \voiceTwo { bd4. sn bd sn8 r bd} }
        >>
    }
>>

%%%%%